Figure 2From: A second order box-type scheme for fractional sub-diffusion equation with spatially variable coefficient under Neumann boundary conditions The error surface figures with \(\pmb{h=\tau=\frac{1}{10}}\) (left) and \(\pmb{h=\tau=\frac{1}{40}}\) (right) when \(\pmb{\alpha=0.8}\) . Back to article page